I own a "07" Classic Tourer. Same thing, flipped ignition to start and no go. Horn worked etc, blah blah. lol
I wasn't stranded, but irritated with a new bike that wouldn't start. Kept working the switch until it started, and went straight to the dealer. Dealer fixed, no more issue.
Took a while to trust the bike again, but do so now. I had owned a "08" Sprint
ST, that run like a champ and very reliable.
I thought that this was an older R3 problem. You would think the dealers would put a little pressure on Triumph to fix this issue at the factory.
Triumph cars were notorious for electrical problems. I figured it was karma and maybe a Monday or a Friday, when the ignition was wired and installed. lol
Sorry to hear about your luck. Please feel free to put me on the list.